Form element to toggle the debug setting

There seems to be a services_debug variable which can be used to toggle debugging mode, which is for example used in the Drupal amfphp module, and the only trace I find of it in the Services module is in the uninstall hook.

It would be nice if there was added a form element in the Services settings page, to toggle the debugging on/off, as now the only way to control this is modifying the variables database table by hand.

I am willing to provide a patch if there is interest.